Pump.



A( M. FARMER.

PUMP.

Arnlcmon man ocr. 2z. |915.

\ 1,233,358. Patented July 17, 1917.

UNITED Kstratifi:

ALBERT M. FARMER, 0F DETROIT, MICHIGAN.

PUMP.

Specification of Letters Patent.

l atcllted July 17, .1917.

Application filed October 22, 1915. SeriaiNo. 57.226.

lumps, of'which the following is a's'pecih.

cation.` reference being had therein to the aceoinpau ving ,lr'awings.

'.lhs invention relates to a pump of the pistou or j ilunger type and to an arrangement of a screw feed therefor whereby the end thrust o l" the piston so transmitted as to be :.listributed over the driving?J members withmit undue pressure 1n any one point that would tend to cause the mechanism to bind.

The invention` consists in the matters hereinaftcr set forth, and more particularly pointed ont in the appended claims.

ln the drawlngs,

, Figure 1 is a view 1n longitudinal vcrt'icah seiztion of a pump that embodies features of the invention;

Fig. 2 is a plan View of `the pump7 partially broken arfay and partially in section; and l Fie'. 3 is a view in cross section taken on or about line IIL-III of Fig. 1.v

Referring to the drawings, a cylinder 1 is .closed at one end by a cap or head 2 provided with an automatic intake valve 3 and discharge valve 4, the latter being-of any approved type and, herein illustrated, of the ball closure variety. At thc other end. ofthe cylinder;V a head 5 that nrt'v--bc permanently attachedto the cylinder. s provided with a bearing 6. f

A.; 7 that may be of the trunk type and y"inay" be slightly reduced below or beyond the packing rings 8 which are employed usual, is in slidingl engagement with the cylilnler. The body 9 of the piston is reciprooable and rotatable on a diamond.

threaded sh afthead 1.0 which is carried by a drive shaft 11 rotatable in the bearing boss 6, a collar 12 formed on or secured to the shaft and appropriately disposed thrust bearings 13 and 14: preventing,f ende-'isc motion of the shaft. A ball 15 which is entered in the diamond screw 16 of the head 10, is held therein by the cupped or recessed end of a ystud 17 secured in rihebody wall of the piston With the head thereof playing in a slot longitudinally'arranged in the wall of vthe cylinder l The ball 15 and its retaining .stud i7 are so disposed in relation to the diamond threzul'llmt the bal] will of itself produce the .ma-.esgary reeiprocatine .n'lovcn'icnt in the piston `Twhcn the shaft 1l is rotated.

lin order to assist this n'iovcment, and to avoid excessive plefsure on the bali 15, another ball 1S is yieldably held in the screw threads' by a block 19 backed by a spring member 2() which is in con'rl'nession between the block and a sleeve 21 that is carried by the body 9 of the piston. The block 1.9 is reciprocable in a slot longitudinally formed in the piston body l) of suilicient length so that the block recedes and advances in the piston a distance equal to the half pitch distance of the diamond thread. Therefore when at the beg-'11min c' of each movcn'ient, in accordance with the revolution of the screw thread, the ball 19 assists in driving the piston 7 and relieves to that extent the'endwise pressure on t-he ball 15. 'llo prevent accidental dislodgment of the blockwvhen at either' end of the limit of motion, a check ball 22 backed by a spring Qln the recess Yof a st'lid 2li yieldinglylocks theblock and prevents its movement except finder the reversal `movement of the thread.

To further assist the movement of the. block a third ball indicated at 25 is likewise held by a yieldingly pressed slide block 2G in the diamond thread,v its movement being insured by a slot 27 that permits the block 2G to advance or recede a distance equal to one-quarter ofthe pitch distance of the diamond thread.. i

In operation, col'lsidering Fig. l, and sup- 4posinrer the shaft revolves in an anti-clockwise. direction while looking at the' ligure from the right, the piston is at the' beginning of its stroke toward the left and all three balls assist in this n'lovel'nent. Then the piston is at a point one-half turn of the shaft from its limit of motion or extreme left position7 the b=\ll 1S is at the end of 'the forward screw. After another one-fourth revolution ball 18' is in the return screw, block 19 sliding tothe right of its slot, and ball. 25 at the end of the forward screw. After another one-fourth revolution, ball 15 is at the end of the forward screw and the piston on the point of moving to the right, the block 2G at the' right end of the slot '27 and the block 19'at the right end of its slot, and, hence all the halls are located to assist in moving the pistonlto the right. There- I'ore only at the lernlination o'llthe piston stroke in either direction, is the strain thro\\'n on one or two of the balls alone, that is, within one-l|uarter and one-halt of the shalt revolution of the end of the stroke, and during' the last one-quarterof revolution one ball only aetive. Theblfoe 5 15) also moves .relatively to piston a distance ,against excessive pressure beingT forced upon :is a resultthe pump aets certainly and noiselessly and does not wear excessively and is-aut -miati and positive in its motion.

()livionslyg changes in the details of eenstruvtion may be made without departing l'rom the spirit of my invention and I do not eare 'lo limit myself lo any particular form or arrangement -oi parts'.

I that lI vla-im is:-

AHpmnp '-omprisinea eylimler proridedfwith 'inlet and 'Iiseharge valves, a piston reeipromtble and non -rotatable' in the v xfl'inilers, a shaft journaled in the cylinder in sliding' and rotatable engagement with tlie piston, and 'pro\-'id(ul with diamond tlireads-a` lu'einber" fixed i'n. the piston in engeireiinent",y Vwith the thread and members longitudinally reeipreeal in the piston in en# gaem'nent with the thread adapted to e0- operale with the fixed member in d'l'iving the piston longilndina-lly of the shaft when approarhine' either .limit of their respective moremrnte in the `piston.

2. A pm np comprising a eylinder lia-ving an inletand outlet discharge valve, a shaft jouina-ledjin one end portion of the eylinder and provided with a diamond threaded body evteniliiig into the eylinder, a trunk piston reriprm'able land non-rotatablein vthe ("ylin'der and reriplfoeable and rotaahle in relai-ion to the shaft, a tixeddriving member travelingavith the pieton and engaging the diamomlthread and other driving mem- 'vided at l ne enil with I,suitalbl bers longitudinally reeiprmmblr in the piston in engagement with the thread adapted to cooperate with the ixed member to more the piston when approachingr either limit; -ifl their range of motion of the piston.

.3. A |pump comprising a vliiuler prel' l ,v ves Iaiiil'aft the otherl with a shaft bearing, a 'shallt 'rotatable a1id ,iion-reeiprorable in 'the bearingr prtivided with a diai'nondthreaded body into .the cylinder, a trunk piston,reeiprori ble and nona'otatahle in the cylinder and reeiprecable and rotatable on the shaft body, 'and means mountedin the piston in engagement with the screw threads of the body and adapted to operate the piston, the means including members longitudinally reeiproeable in the piston for followingV the reversal et the thread. r

4. A. pump comprisingr a eylinder ln'tving an inlet and a diseharge valve, a shaft jonrnaled in one head of the cylinder, a shaft body on the inner end of the shaft ('orieentrie with the cylinder provided with a diamond thread, a piston reeiproeable .in the e' \,'linder and on the shaft body, means on the vpiston engagingihe rylinder and ]')revent-inr 1rotatien of the piston therein, a driving' member in the piston engaging the lian'iond thread for shifting the piston, and roiipw'at- .ingr driving members having limited longitndinal movement in the piston, and engaging the thread of the shaft body.

A )ump comprising a eylinder haring a valve lhead at 011e end and a shaft lie-.ning hard at the other, 'a shaft. journaled in the bearing head, thrust bearings preventing' longitudinal movement of. the shalt, a dia.-

mond threaded body on the shaft in the cylinder, a trunk piston reci-proeable and nonrotatahle :in the cylinder, and on the shaft body, an'd anti-friction driving menibers mounted in the piston and engagirr;r the dia'- mond thread, some of the members having limited longitudinal movement in the piston.' I f' In testimony whereof I aliiX my signature 

